<?php
namespace lib;
/**
 * 微信授权相关接口
 */
class wechtOauth {
	private $app_id = ''; //公众号appid
  	private $app_secret = ''; //公众号app_secret
    	private $redirect_uri = ''; //授权之后跳转地址
	public function __construct(){
	  	$this->app_id		= config('wechat.AppID');
	  	$this->app_secret	= config('wechat.AppSecret');
	  	$this->redirect_uri = config('wechat.backUrl');
	}
  /**
   * 获取微信授权链接
   * @param $url		授权后跳转地址，可带参数
   * @param $state      额外携带的参数
   */
  	public function get_authorize_url($url='',$state=0){
  		$appid=$this->app_id;
  		$redirect_uri=!empty($url) ? $url : $this->redirect_uri;
    	$redirect_uri = urlencode($redirect_uri);
    	return "https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&redirect_uri=".$redirect_uri."&response_type=code&scope=snsapi_userinfo&state=".$state."#wechat_redirect";
  	}
  /**
   * 获取授权token
   * @param string $code 通过get_authorize_url获取到的code
   */
  public function get_access_token($code){
    $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid={$this->app_id}&secret={$this->app_secret}&code={$code}&grant_type=authorization_code";
    $token_data = $this->http($token_url);

    if($token_data[0] == 200){
      return json_decode($token_data[1], TRUE);
    }
    return FALSE;
  }

  /**
   * 获取授权后的微信用户信息
   *
   * @param string $access_token
   * @param string $open_id
   */
  public function get_user_info($access_token,$open_id){
    if($access_token && $open_id){
      $info_url = "https://api.weixin.qq.com/sns/userinfo?access_token={$access_token}&openid={$open_id}&lang=zh_CN";
      $info_data = $this->http($info_url);

      if($info_data[0] == 200){
        return json_decode($info_data[1], TRUE);
      }
    }
    return FALSE;
  }

  public function http($url, $method='GET', $postfields = null, $headers = array(), $debug = false){
    $ci = curl_init();
    /* Curl settings */
    curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ci, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ci, CURLOPT_TIMEOUT, 30);
    curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);

    switch ($method) {
      case 'POST':
        curl_setopt($ci, CURLOPT_POST, true);
        if (!empty($postfields)) {
          curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
          $this->postdata = $postfields;
        }
        break;
    }
    curl_setopt($ci, CURLOPT_URL, $url);
    curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ci, CURLINFO_HEADER_OUT, true);

    $response = curl_exec($ci);
    $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);

    if ($debug) {
      echo "=====post data======\r\n";
      var_dump($postfields);

      echo '=====info=====' . "\r\n";
      print_r(curl_getinfo($ci));

      echo '=====$response=====' . "\r\n";
      print_r($response);
    }
    curl_close($ci);
    return array($http_code, $response);
  }

}